[third_party/pigweed] Roll 3 commits

e6c298de0b02ef0 pw_cpu_exception_cortex_m: Extend CMake support
880604084981fca pw_cpu_exception: Extend CMake support
7ce9d9d928da68c pw_result: Extend CMake support

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 718e1ba3f429d13..e6c298de0b02ef0
Roller-URL: https://ci.chromium.org/b/8824479809967373121
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8824479809967373121
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id32e36bb4560fb3e8ce2f8895063880f947c78c8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/80560
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 718e1ba..e6c298d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 718e1ba3f429d136ed1d6c5c631bbe7a6941d9c7
+Subproject commit e6c298de0b02ef0ece5f801a809d8b61d081f89d